On Tuesday, 55-year-old Sara Kelly Keenan received something in the mail she’s been waiting for her entire life: an accurate birth certificate.

Keenan was born intersex, with male genes, female genitalia and mixed internal reproductive organs. Now, Keenan, who uses female pronouns, is making history. Hers is believed to be the first birth certificate ever issued in the United States that reads “intersex” in the gender field, instead of “male” or “female.”

“In the United States, birth certificates often provide access to a wide range of public services and critical identity documents, such as state IDs and passports,” Castillo said. “Having birth certificates with gender designations other than male or female provides an enormous sense of validation for a number of non-binary and intersex people.”